117 "Heart rate turbulence" after short periods of spontaneous, non-sustained ventricular tachycardia and its relation with heart rate variability indexes

2005 Europace  
Methods: we studied 64 pts with frequent PVBs, divided according to their complexity: 26 pts with > 10 PVBs/hour (Group I), 32 pts with non sustained ventricular tachycardia (NSVT) (Group ll), 6 pts with sustained VT or fibrillation (VF) during Hoker recording (Group llI). Eleven pts with an ICD and a history of VT/VF (but no NSVT or VT during Hoker recording) were also considered (Group IV). Standard deviation of normal RR intervals (SDNN) and HRT were calculated on the same 24 hour Holter
more » ... rding. Cut-off values for HRT were Turbulence Onset (TO) <0% and Turbulence Slope (TS) >2.5 msec/RR-i. Results: no significant difference in mean age, gender and SDNN values was observed. Pts who presented VT or VF at Hoker recordings had a marked alteration of HRT parameters, which were statistically different from both Group II and I. In particular TS < 2.5 msec/RR-i was detectable in all Group Ill subjects and only in 34% and 27% of, respectively, Group II and I pts (figure). Of interest was the finding that HRT and HRV values of Group IV patients (ICD) were not significantly different from any of the other groups, with mean values similar to those observed in Group II (NSVT).
doi:10.1016/eupace/7.supplement_1.60 fatcat:7uviery5hja5rh5iihdyadgi44